From a82bf696aa39b08c0dfce5569525e61368c6827f Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Tue, 4 Dec 2018 09:31:29 +0100 Subject: usb: chipidea: imx: support configuring for active low oc signal MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The status quo on i.MX6 is that if "over-current-active-high" is specified in the device tree this is configured as expected. If the property is missing polarity isn't changed and so the polarity is kept as setup by the bootloader. Reset default is active high, so active low can only be used with help by the bootloader. On i.MX7 it is similar, but there disabling of over current detection has a similar inconsistency. This patch introduces a new property that allows to explicitly configure for active low over current detection and consistently sets this up. In the absence of an explicit configuration the bit is kept as is. On i.MX7 over current detection is used unless disabled in the device tree. Signed-off-by: Uwe Kleine-König Signed-off-by: Peter Chen --- drivers/usb/chipidea/ci_hdrc_imx.c | 16 ++++++++++++---- drivers/usb/chipidea/ci_hdrc_imx.h | 8 +++++++- drivers/usb/chipidea/usbmisc_imx.c | 28 +++++++++++++++++++++------- 3 files changed, 40 insertions(+), 12 deletions(-) (limited to 'drivers/usb/chipidea') diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c index 56781c329db0..1951b37aa39d 100644 --- a/drivers/usb/chipidea/ci_hdrc_imx.c +++ b/drivers/usb/chipidea/ci_hdrc_imx.c @@ -136,11 +136,19 @@ static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev) data->dev = &misc_pdev->dev; - if (of_find_property(np, "disable-over-current", NULL)) + /* + * Check the various over current related properties. If over current + * detection is disabled we're not interested in the polarity. + */ + if (of_find_property(np, "disable-over-current", NULL)) { data->disable_oc = 1; - - if (of_find_property(np, "over-current-active-high", NULL)) - data->oc_polarity = 1; + } else if (of_find_property(np, "over-current-active-high", NULL)) { + data->oc_pol_active_low = 0; + data->oc_pol_configured = 1; + } else if (of_find_property(np, "over-current-active-low", NULL)) { + data->oc_pol_active_low = 1; + data->oc_pol_configured = 1; + } if (of_find_property(np, "external-vbus-divider", NULL)) data->evdo = 1; diff --git a/drivers/usb/chipidea/ci_hdrc_imx.h b/drivers/usb/chipidea/ci_hdrc_imx.h index fcecab478934..7cc53e2ce564 100644 --- a/drivers/usb/chipidea/ci_hdrc_imx.h +++ b/drivers/usb/chipidea/ci_hdrc_imx.h @@ -11,7 +11,13 @@ struct imx_usbmisc_data { int index; unsigned int disable_oc:1; /* over current detect disabled */ - unsigned int oc_polarity:1; /* over current polarity if oc enabled */ + + /* true if over-current polarity is active low */ + unsigned int oc_pol_active_low:1; + + /* true if dt specifies polarity */ + unsigned int oc_pol_configured:1; + unsigned int evdo:1; /* set external vbus divider option */ unsigned int ulpi:1; /* connected to an ULPI phy */ unsigned int hsic:1; /* HSIC controlller */ diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c index 43a15a6e86f5..4c3839d345cd 100644 --- a/drivers/usb/chipidea/usbmisc_imx.c +++ b/drivers/usb/chipidea/usbmisc_imx.c @@ -356,11 +356,17 @@ static int usbmisc_imx6q_init(struct imx_usbmisc_data *data) reg = readl(usbmisc->base + data->index * 4); if (data->disable_oc) { reg |= MX6_BM_OVER_CUR_DIS; - } else if (data->oc_polarity == 1) { - /* High active */ - reg &= ~(MX6_BM_OVER_CUR_DIS | MX6_BM_OVER_CUR_POLARITY); } else { - reg &= ~(MX6_BM_OVER_CUR_DIS); + reg &= ~MX6_BM_OVER_CUR_DIS; + + /* + * If the polarity is not configured keep it as setup by the + * bootloader. + */ + if (data->oc_pol_configured && data->oc_pol_active_low) + reg |= MX6_BM_OVER_CUR_POLARITY; + else if (data->oc_pol_configured) + reg &= ~MX6_BM_OVER_CUR_POLARITY; } writel(reg, usbmisc->base + data->index * 4); @@ -552,9 +558,17 @@ static int usbmisc_imx7d_init(struct imx_usbmisc_data *data) reg = readl(usbmisc->base); if (data->disable_oc) { reg |= MX6_BM_OVER_CUR_DIS; - } else if (data->oc_polarity == 1) { - /* High active */ - reg &= ~(MX6_BM_OVER_CUR_DIS | MX6_BM_OVER_CUR_POLARITY); + } else { + reg &= ~MX6_BM_OVER_CUR_DIS; + + /* + * If the polarity is not configured keep it as setup by the + * bootloader. + */ + if (data->oc_pol_configured && data->oc_pol_active_low) + reg |= MX6_BM_OVER_CUR_POLARITY; + else if (data->oc_pol_configured) + reg &= ~MX6_BM_OVER_CUR_POLARITY; } writel(reg, usbmisc->base); -- cgit v1.2.3